Anderson Manufacturing Buffer Detent Spring — Mil-Spec Replacement for AR-Pattern Rifles (D2-J019-0000, UPC 661799973427)
Small Part, Big Reliability: Keep Your Receiver Extension Secure
Your rifle’s reliability depends on the little things. The Anderson Manufacturing Buffer Detent Spring is a mil-spec replacement designed to keep the buffer detent properly tensioned so your buffer and action spring stay captured and your receiver extension (buffer tube) remains easy to service. If you’re refreshing a well-used lower, completing a new build, or assembling a spare parts kit, this factory-spec spring delivers the correct length, coil rate, and material consistency trusted by shooters and armorers.
Why Choose the Anderson Buffer Detent Spring?
Mil-Spec Fit & Function: Built to the correct dimensions and coil tension for AR-pattern lowers, ensuring precise interaction with the buffer detent.
Proven Materials: Quality spring steel offers long service life, consistent preload, and resistance to set over time.
Drop-In Replacement: Ideal for maintenance, rebuilds, or correcting tolerance issues caused by worn or mystery-brand springs.
Budget-Smart Reliability: An inexpensive part that prevents big headaches—maintain positive buffer retention and simple takedown.
OEM Pedigree: From Anderson Manufacturing, a widely used name for AR parts and lower components.
Key Features
Purpose-Built Tension: Maintains steady pressure on the buffer detent to retain the buffer during upper/lower separation.
Mil-Spec Geometry: Ensures straightforward compatibility with standard AR-15 pattern lowers and receiver extensions.
Durable Finish: Smooth, consistent coils resist corrosion when properly lubricated and maintained.
Gunsmith-Approved Spare: Lightweight, affordable, and essential—add two to your range bag or bench kit.
Technical Specifications
Product: Buffer Detent Spring
Platform: AR-pattern lowers (AR-15/AR-9 and similar that follow mil-spec lower parts dimensions)
Material: Spring steel (factory spec)
Color/Finish: Standard spring finish
Manufacturer: Anderson Manufacturing
Manufacturer Part #: D2-J019-0000
UPC: 661799973427
Compatibility Note: Designed for receivers that use a standard buffer detent and spring under a carbine or rifle receiver extension. Not intended for platforms that eliminate the buffer detent assembly.
Ideal Use Cases
Routine Maintenance: Replace tired or kinked springs to restore correct buffer retention.
New Builds: Ensure consistent results by starting with fresh Anderson components.
Spare Parts Kits: Keep extras on hand—springs are easy to lose and cheap insurance for match day or classes.
Troubleshooting: Inconsistent buffer retention, sloppy takedown feel, or buffer jumping past the detent can indicate a weak spring.
Best Practices & Care
Inspect During Cleaning: Check the spring for deformation or set; replace at the first sign of fatigue.
Use Quality Parts: Pair with a mil-spec buffer detent and receiver extension for reliable alignment.
Protect from Corrosion: Light oil during assembly and routine care helps prevent rust and preserves coil integrity.
Safe Assembly: Always follow manufacturer guidance for your specific receiver and parts; professional installation/inspection is recommended.
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Frequently Asked Questions
Q: Will this work in my AR-15 lower?
A: It’s designed to mil-spec dimensions for AR-pattern lowers that use a standard buffer detent and spring. If your platform is proprietary, verify with the manufacturer.
Q: When should I replace the buffer detent spring?
A: Replace if it’s bent, shortened from set, corroded, or if your buffer isn’t reliably retained when separating the upper and lower.
Q: Do I need special tools?
A: No specialized tools are typically required, though proper armorers’ tools make the job easier. Always follow safe handling procedures and manufacturer instructions.
Q: Is this included in a full lower parts kit?
A: Many LPKs include it, but standalone replacements are helpful for spares or targeted maintenance.
Suggested Meta Data for Your Product Page
Meta Title: Anderson Manufacturing Buffer Detent Spring | Mil-Spec AR-15 Replacement (D2-J019-0000)
Meta Description: Keep your AR reliable with the Anderson Buffer Detent Spring—mil-spec fit, durable spring steel, and consistent retention. Part D2-J019-0000, UPC 661799973427.
Why Buy This Spring?
Correct, consistent tension for long-term buffer retention
Mil-spec compatibility across standard AR-pattern lowers
Low-cost, high-impact reliability upgrade or spare
A dependable rifle starts with dependable small parts. Refresh your lower with the Anderson Manufacturing Buffer Detent Spring and keep your build running smooth.
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